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Worksheets9th Physical Science
Total questions: 108
Worksheet time: 54mins
A polymer of sugar molecules is called a(n)
DNA
carbohydrate
protein
amino acid
Which object has the greatest inertia?
a bowling ball
a beach ball
a tennis ball
a volleyball
Of the following, the greatest gravitational pull would occur between
a marble and a baseball 5 meters apart
the moon and Earth
a loaded freighter on the high seas and Earth
the moon and an astronaut standing on the moon
Which of the following is a negatively charged particle?
proton
electron
neutron
coulomb
In order to increase a car's speed, the force pushing it forward must be
kinetic friction
rolling friction
fundamental friction
a negative force
When the motion of an object is shown by a straight line on a distance vs. time graph with distance on the Y axis, the slope of the line is the
time of travel
displacement
speed
distance traveled
What is the mechanical advantage of a single, fixed pulley?
2
0.5
4
1
Express the following as an equation: One newton is the force that can give an object with a mass of 1 kg an acceleration of 1 m/s2
1 N x 1 kg = 1 m/s2
1 N = 1 kg ÷ 1 m/s2
1 N = 1 m/s2 ÷ 1 kg
1 N = 1 kg x 1 m/s2
_____ is the opposition posted by a material to the flow of the current.
charge
voltage
ampere
resistance
Often atoms join so that each atom will have
an outermost energy level that is full of electrons
an equal number of protons and electrons
an even number of electrons
more electrons than either protons or neutrons
A compound differs from a mixture because it
always remains frozen even at high temperatures
is formed from two cations
is held together by chemical bonds
can form only in the presence of heat energy
Increasing which of these conditions results in more gravitational force between two objects?
mass
surface area
distance
acceleration
The polymer _______ determines your genetic makeup.
carbohydrate
DNA
glucose
methane
The bonds that hold atoms together behave most like
glue
snap-together blocks
rubber cement
springs
A ramp is a simple inclined plane that allows one to apply an input force ____ the output force.
less than
perpendicular to
greater than
equal to
Earth pulls on the moon and holds the moon in its orbit. The moon pulls on Earth with an equal and opposite force. This is an example of
Newton's First Law
Newton's Second Law
Newton's Third Law
none of the above
Which of the following does NOT indicate velocity?
40 mi/h toward the town square along the main street
14 ft/s SSE
28 miles from Los Angeles to Catalina Island
80 km/h going from New York to New Jersey
Mechanical energy can change to nonmechanical energy as a result of
air resistance
radiation
heat
none of the above
Which of the following objects exerts a gravitational force?
a feather
a bowling ball
a book
all of the above
Which molecules are most strongly attracted to one another?
oxygen molecules
hydrogen molecules
water molecules
nitrogen molecules
_____ is the measure of the ability to do work.
photosynthesis
respiration
energy
power
When an object is in free fall, the only force acting on it is
gravity
inertia
terminal velocity
friction
If two objects with different masses and traveling with different velocities collide, what law allows you to predict the motion of the objects after the collision?
Newton’s third law
Newton's second law
the law of conservation of momentum
the law of universal gravitation
_____ is defined as the rate at which work is done.
mechanical advantage
power
joule
speed
Which is an example of projectile motion?
a rolling bowling ball
a balloon rising in the air
a high-speed train accelerating
a dart thrown at a dart board
Atoms sometimes form bonds to
lose energy
become more stable
give away protons
give away neutrons
If an equal force is applied to two cars of equal mass, Car A and Car B, Car A will have _____ acceleration as (than) Car B.
the opposite
less
greater
the same
If the net force acting on a stationary object is zero, then the object will
begin moving backwards
accelerate in the direction of the strongest force
remain at rest
decelerate at a steady rate of speed
When two hydrogen atoms bond, the positive nucleus of one atom attracts the
negative electrons of the other atom
positive nucleus of the other atom
positive electron of the other atom
negative nucleus of the other atom
Which statement illustrates Newton’s first law?
As a car comes to a stop, the passengers continue to move forward.
A stone will not move unless something pushes or pulls it
A ball rolling across the floor eventually slows down.
all of the above
When velocity changes by the same amount over each time interval, acceleration is
negative
zero
constant
positive
Which of the following models would show the bond angle?
ball-and-stick
structural
formula
space-filling
When centripetal acceleration occurs, an object
slows down
is stationary
speeds up
changes direction
Because the overall charge in a compound must be _____, the charge of iron in Fe2O3 can be calculated as 3+.
1+
2+
1-
0
What is the unbalanced force that slows down a ball rolling across the floor?
the force of friction
the force of inertia
the force of momentum
the force of gravity
A(n) _____ is a solution that conducts electricity.
electrode
terminal
electrolyte
voltage
An electric cell is a source of electric current because of a _____ between the terminals.
potential difference
semiconductor
light bulb
resistance
Free-fall acceleration near Earth’s surface
depends on an object's weight
is the same for all objects
depends on an object's mass
none of the above
The electric force between two objects _____ when the distance between them decreases.
decreases
increases
remains constant
none of the above
The attraction between molecules tends to be _____ the attraction between ions.
weaker than
stronger than
equal to
none of the above
The law that states that the unbalanced force acting on an object equals the object’s mass times its acceleration is
the law of conservation of momentum
Newton's first law of motion
Newton's second law of motion
Newton's third law of motion
Using lubricants on engine parts is an example of reducing
acceleration
force
motion
friction
Appliances connected so that they form a single pathway for charges to flow are connected in a(n)
series circuit
closed circuit
open circuit
parallel circuit
Which of the following will result in the greatest acceleration?
23N acting on a 5-kg box
23N acting on a 2-kg box
56N acting on a 2-kg box
56N acting on a 1-kg box
Each molecule of hydrochloric acid, HCl, contains one atom of hydrogen and
one atom of oxygen
two atoms of chlorine
two atoms of oxygen
one atom of chlorine
Which of the following speeds is the most accurate?
100 miles per second
100 miles per minute
100 miles per hour
100 miles per day
A circuit breaker acts as a switch creating a(n) _____ circuit when current is too high.
closed
series
open
parallel
_____ is the ratio of useful work output to work input.
kinetic energy
efficiency
power
potential energy
A car is parked on a hill. In order to keep the car from rolling downhill, how great must the static friction acting on the car be?
greater than the force pulling the car downhill
greater than the force pulling the car uphill
equal to the force pulling the car downhill
smaller than the force pulling the car uphill
The rate at which charges move through a conductor is called
current
resistance
voltage
electrical potential energy
When gravitational forces and air resistance equalize on an object that is falling toward Earth and the object stops accelerating, what is the velocity of an object called?
resultant velocity
terminal velocity
average velocity
instantaneous velocity
If the net force on an object is zero then the object has
unbalanced forces
action forces
reaction forces
balanced forces
Speeding up, slowing down, and changing direction is best described as
acceleration
distance
velocity
balanced foreces
The law that states that for every action force there is an equal and opposite reaction force is
Newton's first law of motion
the law of conservation of momentum
Newton's third law of motion
Newton's second law of motion
Which of the following statements is true?
Frictional forces are greatest when both surfaces are rough.
Friction can exist between two objects even when they are not in contact.
Air resistance always opposes friction.
When a truck is parked on a hill, friction pulls the truck down the hill.
Lifting a car using a car jack is easier because it requires
less force
less time
less work
none of the above
One newton is the force that can give a mass of 1 kg an acceleration of
1 m/s
9.8 m/s
9.8 m/s2
1 m/s2
In which type of bond do atoms share electrons?
covalent bonds
polyatomic bonds
metallic bonds
ionic bonds
There are strong bonds between the atoms in a piece of quartz. These bonds give quartz a
high melting point
high molecular mass
low molecular mass
low melting point
A dropped racquetball will not return to its original position because
energy is not conserved
potential energy is inefficient
some of the mechanical energy is converted to nonmechanical energy
the mechanical energy is stored up for later bounces
Which of the following requires friction?
writing a letter
skiing
cleaning a pan
all of the above
An ionic bond is a bond that forms between
one atom's nucleus and another atom's electrons
ions with opposite charges
the electrons of two different atoms
atoms with neutral charges
What happens immediately after a sky diver opens her parachute?
The force of gravity greatly increases.
The sky diver is in free fall.
The sky diver's speed greatly increases.
Air resistance greatly increases.
The law of conservation of energy states that energy
is always equal and opposite
cannot be created or destroyed
is created from motion
can only be converted into heat
Sodium has one electron in its outer shell and chlorine has seven electrons in its outer shell. The atoms will form a(n) _____ bond by _____ their electrons.
covalent, transferring
ionic, sharing
ionic, transferring
covalent, sharing
At the top of its arc, a thrown ball has _____ potential energy.
minimum
average
zero
maximum
Which of the following models could be used to compare the sizes of atoms in a molecule?
formula
ball-and-stick
structural
space-filling
A tug-of-war that results in one team pulling the other across the line is an example of
balanced forces
action forces
unbalanced forces
reaction forces
Copper atoms are held together by _____ bonds.
ionic
hydrogen
covalent
metallic
Current is the rate at which charges move through a(n)
conductor
joule
insulator
voltage
The transfer of energy to a body by the application of a force that causes the body to move in the direction of the force is called
distance
mechanical advantage
work
power
Potential difference is measures in
volts
coulombs
amperes
joules
In the absence of air resistance, how would the acceleration of a 1.5 kg book and the acceleration of a 15 kg rock differ if the objects were dropped from the same height?
The book would accelerate twice as fast as the rock.
The book would accelerate ten times as fast as the rock.
The rock would accelerate twice as fast as the book.
They would not differ; they would be the same.
Acceleration is defined as the change in velocity divided by
speed
time
final velocity
distance
The gravitational force between two objects depends on masses of objects and
acceleration of objects
distance between objects
sizes of objects
speeds of objects
The combination of all of the forces acting on an object is called the
super force
union of forces
total force
net force
The SI unit for speed is
ft/s2
m/s
mph
Δv/t
All organic compounds must contain the element
oxygen
nitrogen
carbon
hydrogen
A compound is held together by
chemical bonds
magnetism
gravity
physical bonds
A system that receives energy from external sources is called
open
compound
efficient
closed
What are the two families of simple machines?
inclined plane and lever
first class and second class
pulley and screw
wedge and compound
In order to determine speed, you must know
both time and distance
only distance
neither time nor distance
only time
In most cases, increasing the temperature of an object will _____ its resistance.
decrease
nullify
increase
have no effect on
The _____ of an object consists of its speed and
direction.
displacement
average speed
velocity
instantaneous speed
An example of helpful friction is
getting holes in your socks.
writing on paper with a pen.
car tires wearing out
scraping your knee on the floor.
Peter runs in a constant direction on a straight road. The velocity vs. time graph of Peter’s motion shows a straight line with a negative slope. What does the line tell you about Peter’s speed?
It is increasing.
It is constant.
It is decreasing.
It is decreasing, then increasing.
Which of the following has the lowest resistance?
superconductor
conductor
semiconductor
insulator
Astronauts “float” when inside an orbiting spaceship because they are
outside Earth's gravity
in free fall
in a vacuum
weightless
On a speed-time graph, a line with a negative slope indicates that the object it
traveling at a constant speed
speeding up
slowing down
not moving
A wedge is a modified
pulley
wheel and axle
lever
inclined plane
Which of the following has a momentum of zero?
a plane flying through the air
a newspaper lying on a table
a leaf falling to the ground
all of the above
Levers are divided into _____ classes based on the location of the fulcrum and of the input and output forces.
five
four
two
three
The law that states that every object maintains constant velocity unless acted on by an unbalanced force is
Newton’s second law of motion.
the law of conservation of momentum.
Newton’s third law of motion.
Newton’s first law of motion.
A carbon atom can bond to four other atoms because it has
four different cations.
two inner energy levels.
four valence electrons.
no protons in its nucleus.
The SI unit of resistance is the
ampere.
volt.
joule.
ohm.
An object is in motion when
you observe the object move.
the object’s speed increases.
the object changes position relative to a stationary reference point.
the object’s displacement is greater than the distance traveled.
When a glass rod is rubbed with silk and becomes positively charged,
the silk remains neutral.
protons are removed from the silk.
electrons are removed from the rod.
protons are added to the silk.
Electric field lines show the strength and _____ of an electric field.
friction
polarization
direction
temperature
As a dropped penny falls toward the ground, _____ energy is converted to _____ energy.
thermal, potential
kinetic, heat
kinetic, vibrational
potential, kinetic
Average speed can be represented by the mathematical expression
time – distance
distance/time.
time + distance.
distance × time.
On a distance vs. time graph of an object’s motion, distance is usually
the dependent variable.
greater than time.
measured in ft/min.
plotted on the x-axis.
Individual components in a parallel circuit experience the same
dissipation.
voltage.
power.
current.
Which of the following is a compound?
paint
air
soup
salt
Positive charges _____ one another.
repel
attract
cancel
join
Force is a quantity made up of
weight and speed.
mass and velocity.
time and acceleration.
magnitude and direction.
Batteries typically have
two positive terminals.
two negative terminals.
one positive and one negative terminal.
no terminals.
When there is an equal amount of positive and negative charges on an object, the object is
supercharged
positively charged
neutral
negatively charged
An electric current is produced when charges are accelerated by an electric field to move to a position of potential energy that is
higher
infinite
lower
equal
